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Former Rep. Gabby Giffords in Charlotte for DNC

Gabrielle Giffords
Rep. Gabrielle Giffords at the State of the Union address on January 24, 2012. CBS News

CHARLOTTE, N.C. -- Former Democratic Rep. Gabrielle Giffords of Arizona is in town for the Democratic National Convention, sources confirm to CBS News.

Giffords is "excited to be here," a source said. While she is participating in the convention at which President Obama will accept the Democratic nomination for president, she has no "formal role" tonight, according to the Obama campaign. It's possible Giffords could have a formal role on Thursday, the final night of the convention. Roll Call reports she will deliver the Pledge of Allegiance.

The former congresswoman was severely wounded in a 2011 mass shooting in Tucson, Arizona, and she stepped down from Congress in January this year to continue her recovery.